I think this is a case of hunanizing deer. Just because we don't lke to hunt in heavy rain, we may think the same apllies to deer. They live it every day and cope with it much better than we do.
Understanding how deer react to different weather conditions, including rain, makes us better hunters. My deer hunting days are valuable to me and I hunt under all weather conditions. Whether it's in my treestand with my tree umbrella to keep my dry or still hunting in pouring rain, I love being there. I have seen/shot deer in weather that put most hunters back at camp playing cards or watching watching sports. That's OK, if that's your decision. No problemo, but I have never regtetted returning back to camp soaking wet without even seeing a deer.